Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session A26: Superconducting Circuits: Qubit Control and Entanglement
8:00 AM–11:00 AM,
Monday, March 4, 2019
BCEC
Room: 160B
Sponsoring
Unit:
DQI
Chair: Shannon Harvey, Harvard University
Abstract: A26.00009 : Fast Amplification and Rephasing of Entangled Cat States in a Qubit-Oscillator System*
9:36 AM–9:48 AM
Presenter:
Tomoko Fuse
(National Institute of Information and Communications Technology)
Authors:
Tomoko Fuse
(National Institute of Information and Communications Technology)
Zhihao Xiao
(Louisiana State University)
Sahel Ashhab
(Qatar Environment and Energy Research Institute)
Fumiki Yoshihara
(National Institute of Information and Communications Technology)
Kouichi Semba
(National Institute of Information and Communications Technology)
Masahide Sasaki
(National Institute of Information and Communications Technology)
Masahiro Takeoka
(National Institute of Information and Communications Technology)
Jonathan P Dowling
(Louisiana State University)
In this work [1], we study a qubit-oscillator system described by the quantum Rabi model with a time-dependent coupling coefficient. and present two schemes. We propose a scheme for the fast generation of entangled Schrödinger-cat states. We propose another scheme for protecting the cat states against dephasing caused by the nonlinearity in the system. We focus on the case where the qubit frequency is small compared to the oscillator frequency. We first present the exact quantum state evolution in the limit of infinitesimal qubit frequency, and then analyze the first-order effect of the nonzero qubit frequency. Our scheme works for systems with wide range of coupling strength, including the ultra-strong and deep-strong coupling regimes [2-5].
[1] Z. Xiao, T. Fuse, et al., arXiv: 1807.04927. [2] T. Niemczyk, et al., Nature Phys. 6, 772 (2010). [3] P. Forn-Diaz, et al., Phys. Rev. Lett. 105, 237001 (2010). [4] P. Forn-Diaz, et al., Nature Phys. 13, 39 (2017). [5] F. Yoshihara, T. Fuse, et al., Nature Phys. 13, 44 (2017).
*T.F., F.Y., K.S., M.S., and M.T. would like to acknowledge support from JST CREST (Grant No. JPMJCR1775). Z.X and J.P.D. would like to acknowledge AFOSR, ARO, DARPA, NSF, and NGAS.
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